qgraphicssvgitem.cpp

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#include "qgraphicssvgitem.h"

#ifndef QT_NO_GRAPHICSSVGITEM

#include "qpainter.h"
#include "qstyleoption.h"
#include "qsvgrenderer.h"
#include "qdebug.h"

#include "private/qobject_p.h"
#include "private/qgraphicsitem_p.h"

QT_BEGIN_NAMESPACE

class QGraphicsSvgItemPrivate : public QGraphicsItemPrivate
{
public:
    Q_DECLARE_PUBLIC(QGraphicsSvgItem)

    QGraphicsSvgItemPrivate()
        : renderer(0), shared(false)
    {
    }

    void init(QGraphicsItem *parent)
    {
        Q_Q(QGraphicsSvgItem);
        q->setParentItem(parent);
        renderer = new QSvgRenderer(q);
        QObject::connect(renderer, SIGNAL(repaintNeeded()),
                         q, SLOT(_q_repaintItem()));
        q->setCacheMode(QGraphicsItem::DeviceCoordinateCache);
        q->setMaximumCacheSize(QSize(1024, 768));
    }

    void _q_repaintItem()
    {
        q_func()->update();
    }

    inline void updateDefaultSize()
    {
        QRectF bounds;
        if (elemId.isEmpty()) {
            bounds = QRectF(QPointF(0, 0), renderer->defaultSize());
        } else {
            bounds = renderer->boundsOnElement(elemId);
        }
        if (boundingRect.size() != bounds.size()) {
            q_func()->prepareGeometryChange();
            boundingRect.setSize(bounds.size());
        }
    }

    QSvgRenderer *renderer;
    QRectF boundingRect;
    bool shared;
    QString elemId;
};

QGraphicsSvgItem::QGraphicsSvgItem(QGraphicsItem *parent)
    : QGraphicsObject(*new QGraphicsSvgItemPrivate(), 0, 0)
{
    Q_D(QGraphicsSvgItem);
    d->init(parent);
}

QGraphicsSvgItem::QGraphicsSvgItem(const QString &fileName, QGraphicsItem *parent)
    : QGraphicsObject(*new QGraphicsSvgItemPrivate(), 0, 0)
{
    Q_D(QGraphicsSvgItem);
    d->init(parent);
    d->renderer->load(fileName);
    d->updateDefaultSize();
}

QSvgRenderer *QGraphicsSvgItem::renderer() const
{
    return d_func()->renderer;
}


QRectF QGraphicsSvgItem::boundingRect() const
{
    Q_D(const QGraphicsSvgItem);
    return d->boundingRect;
}

static void qt_graphicsItem_highlightSelected(
    QGraphicsItem *item, QPainter *painter, const QStyleOptionGraphicsItem *option)
{
    const QRectF murect = painter->transform().mapRect(QRectF(0, 0, 1, 1));
    if (qFuzzyIsNull(qMax(murect.width(), murect.height())))
        return;

    const QRectF mbrect = painter->transform().mapRect(item->boundingRect());
    if (qMin(mbrect.width(), mbrect.height()) < qreal(1.0))
        return;

    qreal itemPenWidth;
    switch (item->type()) {
        case QGraphicsEllipseItem::Type:
            itemPenWidth = static_cast<QGraphicsEllipseItem *>(item)->pen().widthF();
            break;
        case QGraphicsPathItem::Type:
            itemPenWidth = static_cast<QGraphicsPathItem *>(item)->pen().widthF();
            break;
        case QGraphicsPolygonItem::Type:
            itemPenWidth = static_cast<QGraphicsPolygonItem *>(item)->pen().widthF();
            break;
        case QGraphicsRectItem::Type:
            itemPenWidth = static_cast<QGraphicsRectItem *>(item)->pen().widthF();
            break;
        case QGraphicsSimpleTextItem::Type:
            itemPenWidth = static_cast<QGraphicsSimpleTextItem *>(item)->pen().widthF();
            break;
        case QGraphicsLineItem::Type:
            itemPenWidth = static_cast<QGraphicsLineItem *>(item)->pen().widthF();
            break;
        default:
            itemPenWidth = 1.0;
    }
    const qreal pad = itemPenWidth / 2;

    const qreal penWidth = 0; // cosmetic pen

    const QColor fgcolor = option->palette.windowText().color();
    const QColor bgcolor( // ensure good contrast against fgcolor
        fgcolor.red()   > 127 ? 0 : 255,
        fgcolor.green() > 127 ? 0 : 255,
        fgcolor.blue()  > 127 ? 0 : 255);

    painter->setPen(QPen(bgcolor, penWidth, Qt::SolidLine));
    painter->setBrush(Qt::NoBrush);
    painter->drawRect(item->boundingRect().adjusted(pad, pad, -pad, -pad));

    painter->setPen(QPen(option->palette.windowText(), 0, Qt::DashLine));
    painter->setBrush(Qt::NoBrush);
    painter->drawRect(item->boundingRect().adjusted(pad, pad, -pad, -pad));
}

void QGraphicsSvgItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
                             QWidget *widget)
{
//    Q_UNUSED(option);
    Q_UNUSED(widget);

    Q_D(QGraphicsSvgItem);
    if (!d->renderer->isValid())
        return;

    if (d->elemId.isEmpty())
        d->renderer->render(painter, d->boundingRect);
    else
        d->renderer->render(painter, d->elemId, d->boundingRect);

    if (option->state & QStyle::State_Selected)
        qt_graphicsItem_highlightSelected(this, painter, option);
}

int QGraphicsSvgItem::type() const
{
    return Type;
}

void QGraphicsSvgItem::setMaximumCacheSize(const QSize &size)
{
    QGraphicsItem::d_ptr->setExtra(QGraphicsItemPrivate::ExtraMaxDeviceCoordCacheSize, size);
    update();
}

QSize QGraphicsSvgItem::maximumCacheSize() const
{
    return QGraphicsItem::d_ptr->extra(QGraphicsItemPrivate::ExtraMaxDeviceCoordCacheSize).toSize();
}

void QGraphicsSvgItem::setElementId(const QString &id)
{
    Q_D(QGraphicsSvgItem);
    d->elemId = id;
    d->updateDefaultSize();
    update();
}

QString QGraphicsSvgItem::elementId() const
{
    Q_D(const QGraphicsSvgItem);
    return d->elemId;
}

void QGraphicsSvgItem::setSharedRenderer(QSvgRenderer *renderer)
{
    Q_D(QGraphicsSvgItem);
    if (!d->shared)
        delete d->renderer;

    d->renderer = renderer;
    d->shared = true;

    d->updateDefaultSize();

    update();
}

void QGraphicsSvgItem::setCachingEnabled(bool caching)
{
    setCacheMode(caching ? QGraphicsItem::DeviceCoordinateCache : QGraphicsItem::NoCache);
}

bool QGraphicsSvgItem::isCachingEnabled() const
{
    return cacheMode() != QGraphicsItem::NoCache;
}

QT_END_NAMESPACE

#include "moc_qgraphicssvgitem.cpp"

#endif // QT_NO_GRAPHICSSVGITEM